Carrier route record
DLDEN→LGA
Delta Air Lines · Denver to New York
- Flights
- 1,036
- Period
- July 2025 to June 2026
- Share of route
- 22%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on DEN to LGA carries a cancellation problem, not just a delay problem: 4.4% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, about four flights in five arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,036 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,017 at 74.0% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on DEN to LGA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.0%
Arrivals under 15 minutes late, of 977 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
4.44%
National rate is 1.81%
Whole route
71.5%
Every carrier on DEN to LGA, 4,672 flights
These figures cover 1,036 flights between July 2025 and June 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Delta against every carrier on DEN to LGA
Delta flew 1,036 of the 4,672 flights on DEN to LGA, about 22% of it. Its 79.0% on time is 8 points better than the route as a whole, which runs 71.5%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Delta at 79.0% to Frontier at 61.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. United Airlines arrives on time 74.0% of the time; Southwest Airlines manages 64.0%. Sample sizes sit next to every figure, because a two-point gap across 1,467 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 1,036 | 79.0% | 81 min | 4.44% | B− |
| United Airlines | 2,017 | 74.0% | 69 min | 1.83% | C |
| Southwest Airlines | 1,467 | 64.0% | 60 min | 2.66% | D |
| Frontier Airlinesthin sample | 152 | 61.6% | 76 min | 3.95% | D− |
United leads Southwest by 10 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Delta flight numbers on DEN to LGA
Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against 10 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am356 flights87.4%
- 8am–11am8 flights—
- 11am–2pm363 flights79.5%
- 2pm–5pm1 flights—
- 5pm–8pm308 flights68.3%
- 8pm–5am—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.4% of the time, against 68.3% for the evening window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 363 flights scheduled in it.
Across the year
Delta on DEN to LGA through the year
June is the worst month at 70.0% on time, 19 points below January, the best at 89.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 89 flights.
Across the week, Saturday is the strongest day at 85.6% on time and Monday the weakest at 74.8%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 45% of the 17,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 45%Carrier
- 29%Late-arriving aircraft
- 22%National Airspace System
- 4%Extreme weather
- 0%Security
The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 7,435 of the 17,000 delay minutes reported here. The split is drawn from 16,526 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.4% on time here.
Cancellations run at 4.44%, against 1.81% nationally. That is roughly one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
8.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
At 1,620 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 71.3% on time across 1,036 flights, 8 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 8 points of difference.
One caution: this is a thin sample. 1,036 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Delta on DEN to LGA
Put together: the delay figures matter less here than the 4.44% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 977 completed flights over 12 months sit behind that.
Related
Where to go next
- DEN to LGA, every carrier
- Delta on LGA to DEN, the return leg
- United Airlines on DEN to LGA74.0%
- Southwest Airlines on DEN to LGA64.0%
- Frontier Airlines on DEN to LGA61.6%
- Delta Air Lines network-wide record
- Denver International (DEN) delay statistics
- LaGuardia (LGA) delay statistics
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.